code: def is_conllu(path):
      """Determines if the file is in CoNLL-U format."""
      return os.path.splitext(path.lower())[1] == ".conllu"
  
file_path: nlp-architect/nlp_architect/models/bist/utils.py
imports: import os
  import subprocess
  from collections import Counter
  from nlp_architect.data.conll import ConllEntry
  from nlp_architect.models.bist.eval.conllu.conll17_ud_eval import run_conllu_eval
label_desc: Use image node_id 5 for calling a global function with example usage: is_conllu(path) and returns: unknown